Dear 승화,
Warm greetings from Koreana Hotel in Seoul. Thank you for taking our time to give us your recent experience at our hotel. We are sorry to hear that you were in trouble with using air-conditioner during your stay. Because we chose central heating/cooling system, it is limited to use in winter or spring. In order to provide the best service, we are going to find better ways with all our staff. Once again, it was sincerely a pleasure to have you as our guest at Koreana hotel. We do hope we can have another opportunity to welcome you back. Thank you very much. Best regards,